CN212387878U

CN212387878U - Device for efficiently treating ammonia nitrogen and COD at tail end of phosphorus chemical wastewater

Info

Publication number: CN212387878U
Application number: CN202021002874.8U
Authority: CN
Inventors: 陈其美; 安仁彬
Original assignee: Guizhou Chuangweidao Environment Technology Co ltd
Current assignee: Guizhou Chuangweidao Environment Technology Co ltd
Priority date: 2020-06-04
Filing date: 2020-06-04
Publication date: 2021-01-22
Anticipated expiration: 2030-06-04

Abstract

The utility model discloses a device for efficiently treating ammonia nitrogen and COD at the end of phosphorus chemical wastewater.A stock solution inlet pipe is arranged on a stock solution mixing barrel, the stock solution mixing barrel is sequentially connected with a liquid medicine mixing pump and a reaction lap along the fluid flow direction, a calandria and a waste gas collecting cover are arranged on the reaction lap, the waste gas collecting cover is connected to the stock solution mixing barrel through a circulating pipeline, an ozone inlet and a liquid medicine inlet are arranged on the liquid medicine mixing pump, the liquid medicine inlet is connected with a dosing barrel, and the ozone inlet is connected with an ozone generator; the utility model discloses can effectually practice thrift the required place of reaction and reaction time, the effectual expense of controlling medicament cost and follow-up required secondary treatment, the ammonia nitrogen that contains in the ability more economic efficient treatment water also can carry out effectual processing to aquatic COD.

Description

Device for efficiently treating ammonia nitrogen and COD at tail end of phosphorus chemical wastewater

Technical Field

The utility model relates to a terminal high-efficient device of handling ammonia nitrogen and COD of phosphorus chemical industry waste water belongs to waste water treatment technical field.

Background

At present, with the rapid development and growth of the industries such as phosphorus chemical industry and the like, the generated high ammonia nitrogen wastewater also becomes one of the industry development restriction factors; according to the report, red tide occurs up to 77 times in 2001 in China's sea area, ammonia nitrogen is one of important causes of pollution, in particular to pollution caused by high-concentration ammonia nitrogen wastewater. Therefore, the economic and effective control of high concentration pollution is also an important subject of current research by environmental protection workers, and is highly regarded by the industry. The general formation of ammonia nitrogen wastewater is caused by the coexistence of ammonia water and inorganic ammonia, generally, the main source of ammonia nitrogen in wastewater with pH above neutral is the combined action of inorganic ammonia and ammonia water, and the ammonia nitrogen in wastewater under the acidic condition of pH is mainly caused by inorganic ammonia. The ammonia nitrogen in the wastewater mainly comprises two ammonia nitrogen components, wherein one is formed by ammonia water, and the other is formed by inorganic ammonia, and the other is mainly ammonium sulfate, ammonium chloride and the like.

The prior common high ammonia nitrogen wastewater treatment process comprises the following steps:

firstly, a stripping method: in alkaline conditions, a method for separation by utilizing the gas-liquid equilibrium relationship between the gas-phase concentration and the liquid-phase concentration of ammonia nitrogen is generally considered to be related to temperature, PH and gas-liquid ratio.

Secondly, zeolite deamination: cation in zeolite is exchanged with NH4+ in waste water to reach the aim of denitrification, the zeolite deamination method must consider the regeneration problem of zeolite, usually there are regeneration liquid method and incineration method, when the incineration method is adopted, the generated ammonia must be treated, the method is suitable for the treatment of low-concentration ammonia nitrogen waste water, the ammonia nitrogen content should be 10-20 mg/L.

Thirdly, membrane separation technology: a method for removing ammonia nitrogen by utilizing the selective permeability of a membrane. The method has the advantages of convenient operation, high ammonia nitrogen recovery rate and no secondary pollution. For example: removing ammonia nitrogen by a gas-water separation membrane. The ammonia nitrogen has dissociation equilibrium in water, and as the PH is increased, the ammonia NH in the water₃The shape proportion is increased, NH is carried out under certain temperature and pressure₃Is in equilibrium with both the gaseous and liquid states. Based on the principle of chemical equilibrium shift, namely the Lu Chadelli (A.L.LE Chatelier) principle. All balances are relative and temporary in nature. Chemical equilibriumOnly under certain conditions can the equilibrium be maintained "if one of the conditions of the equilibrium system, such as concentration, pressure or temperature, is changed, the equilibrium is moved in a direction to attenuate the change. "the following design concept is carried out according to the principle, wherein one side of the membrane is high-concentration ammonia nitrogen wastewater, and the other side of the membrane is acidic aqueous solution or water. When the left side temperature T1>20℃,PH1>9,P1>P2 keeps a certain pressure difference, so the ion ammonia NH4+ in the wastewater is changed into free ammonia NH3, and the free ammonia NH3 is diffused to the surface of the membrane through the interface of the raw material liquid side, passes through the membrane pores under the action of the partial pressure difference of the membrane surface, enters the absorption liquid, and reacts with H + in the acid solution rapidly to generate ammonium salt.

Fourthly, MAP precipitation method: mainly utilizes the following chemical reactions: mg (magnesium)²⁺+NH⁴⁺+PO₄ ^3-=MgNH₄PO₄Theoretically, adding phosphorus salt and magnesium salt into wastewater containing high-concentration ammonia nitrogen in a certain proportion, namely [ Mg ]^{2 +} ][NH⁴⁺][PO₄ ^{3 -}]>Magnesium Ammonium Phosphate (MAP) can be generated when the concentration is 2.5 multiplied by 10 < -13 >, and ammonia nitrogen in the wastewater is removed.

Fifthly, biological method: at present, the mature biological treatment method applied to the actual treatment of ammonia nitrogen sewage at home and abroad is the traditional preposed denitrification biological denitrification, such as an A/O, A2/O process and the like, and can remove ammonia nitrogen in sewage to a certain extent. The traditional biological denitrification approach generally comprises two stages of nitrification and denitrification, wherein the nitrification and denitrification reactions are respectively completed by the action of nitrifying bacteria and denitrifying bacteria, and because the requirements on environmental conditions are different, the two processes can not be simultaneously performed but can be performed in a sequential manner, namely, the nitrification reaction occurs under the aerobic condition and the denitrification reaction occurs under the anoxic or anaerobic condition. The biological denitrification process developed from this process mostly separates an anoxic zone from an aerobic zone to form a staged nitrification-denitrification process so that nitrification and denitrification can be performed independently. In 1932, Wuhrmann established post-denitrification process (post-denitrification) by utilizing endogenous denitrification, Ludzack and Ettinger proposed pre-denitrification process (pre-denitrification) in 1962, in 1973 Barnard combined with the former two processes proposed A/O process, and later various improved processes such as Bardenpho, Phoredox (A2/O), UCT, JBH, AAA process and the like, which are typical traditional nitrification and denitrification processes.

Sixthly, a chemical oxidation method: a method for removing ammonia nitrogen by directly oxidizing the ammonia nitrogen into nitrogen by using a strong oxidant. The breaking point chlorination is to utilize ammonia generated by the reaction of ammonia and chlorine in water to remove ammonia, and the method can also play a role in sterilization, but the generated residual chlorine has an influence on fishes, so that a residual chlorine removal facility is required to be additionally arranged.

The breakpoint chlorination method is a chemical denitrification process for oxidizing NH3-N in wastewater into N2 by introducing chlorine or sodium hypochlorite into the wastewater. When chlorine gas is introduced into the wastewater to a certain point, the content of free chlorine in the wastewater is the lowest, and the concentration of ammonia is reduced to zero. When the amount of chlorine gas introduced exceeds this point, the amount of free chlorine in the water increases. This point is therefore referred to as the break point, and chlorination in this state is referred to as break point chlorination. The actual chlorine amount required for treating the ammonia nitrogen sewage depends on the temperature, the pH value and the ammonia nitrogen concentration. And 9-10 mg of chlorine is needed for oxidizing ammonia nitrogen per gram. The pH value is 6-7, the optimum reaction range is obtained, and the contact time is 0.5-2 hours.

Effluent treated by the breakpoint chlorination method generally needs to be subjected to dechlorination by using activated carbon or sulfur dioxide before being discharged so as to remove residual chlorine in the water. About 0.9 to 1.0mg of sulfur dioxide is required for 1mg of residual chlorine. Hydrogen ions are generated during the reverse chlorination, but the decrease in pH caused by this is generally negligible, so that only about 2mg (as CaCO) is consumed to remove 1mg of residual chlorine₃Meter). The mechanism of ammonia removal by the breakpoint chlorination method is as follows: cl₂+H₂O→HOCl+H⁺+Cl^－ NH₄++HOCl→NH₂Cl+H⁺+H₂O NHCl₂+H₂O→NOH+2H⁺+2Cl^－ NHCl₂+NaOH→N₂+HOCl+H⁺+Cl^－

The most outstanding advantage of the breakpoint chlorination method is that the chlorine adding quantity and the flow quantity can be correctly controlled for homogenizing, so that all ammonia nitrogen in the wastewater is reduced to zero, and the wastewater can be disinfected; the treatment effect is optimal but has some obvious disadvantages as follows: one method is that the dosage can not be effectively controlled, the dosage is small, the reaction is incomplete easily, the treatment effect is not ideal, the dosage is large, the reaction is excessive easily, and the secondary treatment cost is increased due to more chloride ions; secondly, collecting chlorine generated in the reaction process after adding the chemicals, and carrying out secondary treatment; thirdly, the excessive chloride ions in the water in the discharging stage need to be adsorbed again for secondary treatment; fourthly, because the secondary chlorine belongs to the volatile medicine, the phenomenon of volatilization easily occurs in the process of adding the secondary chlorine again, which leads to the waste of the medicine, and fifthly, the site restriction is large, and the requirement of the required reaction site is large.

Namely: the device that phosphorus chemical industry waste water end high-efficient treatment ammonia nitrogen and COD now need, can effectually practice thrift the required place of reaction and reaction time, the effectual expense of controlling medicament cost and follow-up required secondary treatment, the ammonia nitrogen that contains in the ability more economic efficient treatment water also can carry out effectual processing to aquatic COD.

Disclosure of Invention

The to-be-solved technical problem of the utility model is to provide a device of terminal high-efficient processing ammonia nitrogen of phosphorus chemical industry waste water and COD, can effectually practice thrift required place of reaction and reaction time, the effectual expense of controlling medicament cost and follow-up required secondary treatment, the ammonia nitrogen that contains in the ability more economic efficient treatment water also can carry out effectual processing to aquatic COD, can overcome the not enough of prior art.

The technical scheme of the utility model is that: the utility model provides a device of terminal high-efficient handling of phosphorus chemical industry waste water ammonia nitrogen and COD is equipped with the stoste and goes into the pipe on the stoste mixing barrel, and the stoste mixing barrel is taken with the liquid medicine mixing pump and reaction along the fluid flow direction in proper order and is taken continuously, takes to be equipped with calandria and waste gas collection cover at the reaction, and waste gas collection cover is connected to the stoste mixing barrel through circulating line the liquid medicine mixing pump on be equipped with ozone import and liquid medicine entry, the liquid medicine entry links to each other with the medicine bucket, the ozone import links to each other with ozone.

The liquid medicine mixing pump comprises a shell, wherein a mixing chamber is arranged in the shell, a water inlet pipe, a water outlet pipe, a medicine inlet pipe, an air inlet pipe and an exhaust valve are arranged on the mixing chamber, an air chamber and an adjusting valve are arranged on the exhaust valve, a pressure gauge and an automatic control device are arranged on the air inlet pipe, and a side pressure gauge is arranged on an exhaust pipe of the exhaust valve; an impeller is arranged in the mixing chamber, a rotating shaft of the impeller is connected with a gear box, and the gear box is connected with a rotating shaft of a motor.

The two liquid medicine mixing pumps are arranged in parallel.

The circulating pipeline is provided with a branch pipe connected with the dosing barrel.

A medicine feeding pump is arranged on a pipeline between the upper medicine feeding barrel and the liquid medicine mixing pump.

The bottom of the stock solution mixing barrel, the bottom of the reaction tower and the bottom of the medicine adding barrel are provided with aeration pipes, and the aeration pipes of the stock solution mixing barrel and the medicine adding barrel are connected with a circulating pipeline.

Compared with the prior art, the utility model discloses terminal high-efficient handling of phosphorus chemical wastewater ammonia nitrogen and COD's device has following advantage:

compared with the conventional breakpoint chlorination method, the CWHR efficient chlorination reactor can effectively save reaction time, wastewater enters the stock solution mixing barrel again and then is added with sodium hypochlorite through the liquid medicine mixing pump, then the sodium hypochlorite and raw water are uniformly mixed in the liquid medicine mixing pump, a proper amount of ozone is added to reduce COD possibly contained in the water except ammonia nitrogen, the stock solution enters the reaction tower through the liquid medicine mixing pump to prolong the reaction time, so that chlorine and the stock solution are fully reacted, and the reaction equation is as follows:

Cl₂+H2O→HOCl+H⁺+Cl^－ NH₄ ⁺+HOCl→NH₂Cl+H⁺+H₂O NHCl₂+H₂O→NOH+2H⁺+2Cl^－NHCl₂+NaOH→N₂+HOCl+H⁺+Cl^－after the reaction is completed, redundant chlorine is generated, and the gas-collecting hood above the reaction tower collects and discharges one of the redundant chlorine to the dosing barrel for stirring, and one of the redundant chlorine is discharged to the stock solution mixing barrel to be mixed with the stock solution, so that the secondary treatment of the redundant chlorine is omitted, and the cost for adding the chlorine is correspondingly reduced.

Compared with the traditional breakpoint chlorination method, the CWHR efficient chlorination reactor effectively saves the required reaction site, effectively controls the medicament cost and the cost of subsequent required secondary treatment, can treat ammonia nitrogen contained in water more economically and efficiently, and can also effectively treat COD (chemical oxygen demand) in water.

In order to overcome the defect that a large amount of chlorine is needed for treating the ammonia nitrogen wastewater by adopting a breakpoint chlorine adding method, the process system is adopted to fully mix chlorine and raw water at the front end of the water inlet reaction and then carry out reaction in the reaction tower for a prolonged time, and the redundant chlorine is collected and recycled.

Ozone removes COD in water, and the strong oxidizing property of ozone is because oxygen atoms in ozone molecules have strong electrophilicity or proton affinity, new ecological oxygen atoms are generated after ozone decomposition, and organic pollutants in wastewater can be rapidly removed by forming strong oxidizing radicals-hydroxyl free radicals in water, and the ozone decomposes into oxygen, so that secondary pollution is avoided.

Drawings

In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail with reference to the accompanying drawings, in which:

fig. 1 is a schematic view of the connection structure of the present invention.

Fig. 2 is a schematic view of the connection structure of the liquid medicine mixing pump of the present invention.

Wherein, the stock solution mixing barrel 1; a liquid medicine mixing pump 2; a housing 201; a mixing chamber 202; an inlet pipe 203; a water outlet pipe 204; a drug inlet tube 205; an intake pipe 206; an exhaust valve 207; a plenum 208; a regulating valve 209; a pressure gauge 210; an automatic control device 211; a side pressure gauge 212; an impeller 213; a gearbox 214; a motor 215; reaction step 3; a calandria 4; an exhaust gas collection hood 5; a medicine adding barrel 6; an ozone generator 7; and a dosing pump 8.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood that the preferred embodiments are for purposes of illustration only and are not intended to limit the scope of the present invention.

Embodiment 1. as shown in figure 1, a device for efficiently treating ammonia nitrogen and COD at the tail end of phosphorus chemical wastewater comprises a stock solution mixing barrel 1, and is characterized in that: a stock solution inlet pipe is arranged on a stock solution mixing barrel 1, the stock solution mixing barrel 1 is sequentially connected with a liquid medicine mixing pump 2 and a reaction tower 3 along the flow direction of fluid, a discharge pipe 4 and a waste gas collecting cover 5 are arranged on the reaction tower 3, the waste gas collecting cover 5 is connected to the stock solution mixing barrel 1 through a circulating pipeline, an ozone inlet and a liquid medicine inlet are arranged on the liquid medicine mixing pump 2, the liquid medicine inlet is connected with a medicine adding barrel 6, a medicine adding pump 8 is arranged on a pipeline between the medicine adding barrel 6 and the liquid medicine mixing pump 2, and a branch pipe connected with the medicine adding barrel 6 is arranged on the circulating pipeline; the ozone inlet is connected with an ozone generator 7.

The liquid medicine mixing pump 2 comprises a shell 201, a mixing chamber 202 is arranged in the shell 201, a water inlet pipe 203, a water outlet pipe 204, a medicine inlet pipe 205, an air inlet pipe 206 and an exhaust valve 207 are arranged on the mixing chamber 202, an air chamber 208 and an adjusting valve 209 are arranged on the exhaust valve 207, a pressure gauge 210 and an automatic control device 211 are arranged on the air inlet pipe 206, and a side pressure gauge 212 is arranged on the exhaust pipe of the exhaust valve 207; an impeller 213 is arranged in the mixing chamber 202, the rotating shaft of the impeller 213 is connected with a gear box 214, and the gear box 214 is connected with the rotating shaft of a motor 215; the two liquid medicine mixing pumps 2 are arranged in parallel.

The bottom of the stock solution mixing tank 1, the bottom of the reaction tower 3 and the bottom of the dosing tank 6 are provided with aeration pipes, and the aeration pipes of the stock solution mixing tank 1 and the dosing tank 6 are connected with a circulating pipeline.

When the liquid medicine mixing pump 2 is used, required ozone enters the mixing chamber 202 through the air inlet pipe, the pressure gauge 210 measures a corresponding air pressure value, the air pressure value is adjusted to the pressure required by work under the control of the automatic control device 211, a button of the automatic control mechanism is pressed to maintain the pressure, then the stability and the uniformity of the whole air inlet are adjusted through the feedback of the side pressure gauge 212 through the fine adjustment valve, so that the ozone, the sodium hypochlorite and the raw water are stably and uniformly input, and the full and uniform mixing of the raw water, the sodium hypochlorite and the ozone is ensured.

Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.

Claims

1. The utility model provides a device of terminal high-efficient processing ammonia nitrogen of phosphorus chemical industry waste water and COD, it includes stoste blending tank (1), its characterized in that: be equipped with the stoste and go into the pipe on stoste blending barrel (1), stoste blending barrel (1) is taken (3) and is linked to each other with liquid medicine mixing pump (2) and reaction in proper order along the fluid flow direction, is equipped with calandria (4) and waste gas collection cover (5) on reaction is taken (3), and waste gas collection cover (5) are connected to stoste blending barrel (1) through circulating line liquid mixing pump (2) on be equipped with ozone import and liquid medicine entry, the liquid medicine entry with add medicine bucket (6) and link to each other, the ozone import links to each other with ozone generator (7).

2. The device for efficiently treating ammonia nitrogen and COD at the tail end of the phosphorus chemical wastewater according to claim 1, which is characterized in that: the liquid medicine mixing pump (2) comprises a shell (201), a mixing chamber (202) is arranged in the shell (201), a water inlet pipe (203), a water outlet pipe (204), a medicine inlet pipe (205), an air inlet pipe (206) and an exhaust valve (207) are arranged on the mixing chamber (202), an air chamber (208) and an adjusting valve (209) are arranged on the exhaust valve (207), a pressure gauge (210) and a self-control device (211) are arranged on the air inlet pipe (206), and a side pressure gauge (212) is arranged on the exhaust pipe of the exhaust valve (207); an impeller (213) is arranged in the mixing chamber (202), the rotating shaft of the impeller (213) is connected with a gear box (214), and the gear box (214) is connected with the rotating shaft of a motor (215).

3. The device for efficiently treating ammonia nitrogen and COD at the tail end of the phosphorus chemical wastewater according to claim 2, is characterized in that: the two liquid medicine mixing pumps (2) are arranged in parallel.

4. The device for efficiently treating ammonia nitrogen and COD at the tail end of the phosphorus chemical wastewater according to claim 3, is characterized in that: and a branch pipe connected with the dosing barrel (6) is arranged on the circulating pipeline.

5. The device for efficiently treating ammonia nitrogen and COD at the tail end of the phosphorus chemical wastewater according to claim 4, is characterized in that: a medicine feeding pump (8) is arranged on a pipeline between the medicine feeding barrel (6) and the liquid medicine mixing pump (2).

6. The device for efficiently treating ammonia nitrogen and COD at the tail end of phosphorus chemical wastewater according to any one of claims 1-5, characterized in that: aeration pipes are arranged at the bottoms of the stock solution mixing barrel (1), the reaction tower (3) and the dosing barrel (6), and the aeration pipes of the stock solution mixing barrel (1) and the dosing barrel (6) are connected with a circulating pipeline.